Acceleration of a stirrer

  • #1
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Homework Statement


Question: There is a fixed 55 cm long rod (vertical) that is charged uniformly up to +137 nC, Place a 0.5 g plastic 6 cm long stirrer (horizontal) that is charge to +93 nC, 2.3 cm away from the rod

Calculate the Electric force and acceleration on the stirrer .

Homework Equations


E=Q/4piε r√r^2+(l/2)^2
F=qE=ma

The Attempt at a Solution


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Answers and Replies

  • #2
haruspex
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I guess you meant 'finite line', not infinite.
Try a trig substitution for r. What is suggested by the r2+constant part?
 
  • #3
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I guess you meant 'finite line', not infinite.
Try a trig substitution for r. What is suggested by the r2+constant part?
Let r =sqrt (l/2) tantheta?
 
  • #6
haruspex
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Is that reasonable to get a=0.003m/s^2 ?
Not sure. Please post what you get algebraically for the solution to the integral.
 
  • #7
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Not sure. Please post what you get algebraically for the solution to the integral.
Sorry, I left it at school
 

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